Given the task definition and input, reply with output. In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

Littlehampton is a town , seaside resort and pleasure harbour , and the most populous civil parish in the Arun District of West Sussex , England .

Littlehampton is a seaside town in Arun , West Sussex , England .